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Active and passive integrated mixed island detection method

An island detection and hybrid technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as the impact of power grid power quality, and achieve the effect of improving large blind spots, small possibilities, and reducing impacts

Active Publication Date: 2015-05-27
SOUTHEAST UNIV
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Problems solved by technology

Compared with the passive method, the active method can greatly reduce or even eliminate the dead zone, but it will have an impact on the power quality of the grid

Method used

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  • Active and passive integrated mixed island detection method
  • Active and passive integrated mixed island detection method
  • Active and passive integrated mixed island detection method

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0029] Such as figure 1 As shown, the distributed power generation system in this embodiment can be regarded as a constant current source. In order to achieve the maximum output power and minimize the internal loss of the system, the distributed generation system operates in the unit power factor mode. When the power grid is disconnected, the distributed generation system will continue to supply power to the RLC. Since the constant current mode is adopted, the output cu...

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Abstract

The invention discloses an active and passive integrated mixed island detection method. DG system outputted active power P, load consumed active power P+deltaP and load consumed passive power deltaQ are calculated through data collection, a detection method is selected according to a passive blind area criterion, and in a blind area criterion, an SFS detection method in a non-blind area is adopted; an overvoltage / undervoltage and overfrequency / underfrequency device detection method is adopted outside a blind area, the defect that a passive method is large in blind area can be improved, and the non-blind area detection is achieved; since the possibility that in actual operation, a local load is in the passive blind area is low, the influence of the detection method on quality of electric energy can be reduced greatly.

Description

technical field [0001] The invention relates to a hybrid island detection method combining active and passive methods, and belongs to the field of island protection for distributed power generation systems connected to the grid. Background technique [0002] "Island" means that after the public grid stops supplying power, due to the existence of distributed generation (DG) (connected to the grid and transmitting electric energy), some lines in the power outage area of ​​the grid remain charged, forming an island of self-sufficient power supply. Unplanned island operation may cause serious damage to users and power distribution equipment. Therefore, when photovoltaic power generation and other distributed power generation systems are connected to the public grid, island detection is an essential and important function. At present, the islanding detection methods researched at home and abroad mainly include two categories: local islanding detection method and remote communicat...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 蒋平高蕾吴熙冯双
Owner SOUTHEAST UNIV
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